Universal Bipolar Host Materials for Blue, Green, and Red Phosphorescent OLEDs with Excellent Efficiencies and Small-Efficiency Roll-Off

Hu, Shimin1; Zeng, Jiajie1; Zhu, Xiangyu1; Guo, Jingjing1; Chen, Shuming2; Zhao, Zujin1; Tang, Ben Zhong1,3

2019-07-31

10.1021/acsami.9b06995

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

Host materials are indispensable for the fabrication of organic light-emitting diodes (OLEDs) with phosphorescent emitters, but high quality host materials that can efficiently and simultaneously function in blue, green, and red phosphorescent OLEDs (PHOLEDs) are much rare. In this work, four bipolar materials are developed using carbazole and 9,9-dimethyl-9,10-dihydroacridine as hole-transporting groups, pyridine as electron-transporting groups, and biphenyl and m-methylbiphenyl as pi-spacers. The crystal and electronic structures indicate that these materials have highly twisted conformations, which endow them with aggregation induced emission features, intramolecular charge transfer processes, wide energy band gaps, and high triplet energies. The carrier transport ability and energy transfer property analyses show that these materials are able to achieve balanced hole and electron transports and can serve as bipolar host materials for PHOLEDs. A series of monochromatic PHOLEDs with different phosphorescent dopants, including blue-emissive FIrpic, green-emissive Ir(ppy)(2)(acac), and Ir(piq)(2)(acac), are fabricated by employing these four host materials. The green PHOLEDs can provide an impressive luminance of up to 230 200 cd m(-2). Based on an identical host material, excellent external quantum efficiencies as high as 25.12, 24.73, and 19.71%, as well as minor efficiency roll-offi are attained for blue, green, and red PHOLEDs, respectively, clearly demonstrating the promising applications as universal bipolar host materials in PHOLEDs with monochromatic light and white light.

bipolar host aggregation-induced emission carrier transport energy transfer phosphorescent OLEDs

SCI ; EI

英语

其他

Science and Technology Program of Guangzhou[201804020027]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000479020300060

AMER CHEMICAL SOC

20193407342080

Carrier transport ; Charge transfer ; Electronic structure ; Energy gap ; Energy transfer ; Phosphorescence ; Sound insulating materials

Sound Insulating Materials:413.3 ; Electricity: Basic Concepts and Phenomena:701.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Chemical Reactions:802.2

Web of Science

1.South China Univ Technol, Ctr Aggregat Induced Emiss, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
2.South Univ Sci & Technol China, Dept Elect & Elect Engn, Shenzhen 518055, Guangdong, Peoples R China
3.Hong Kong Univ Sci & Technol, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Hong Kong Branch, Dept Chem,Kowloon, Clear Water Bay, Hong Kong, Peoples R China

Hu, Shimin,Zeng, Jiajie,Zhu, Xiangyu,et al. Universal Bipolar Host Materials for Blue, Green, and Red Phosphorescent OLEDs with Excellent Efficiencies and Small-Efficiency Roll-Off[J]. ACS Applied Materials & Interfaces,2019,11(30):27134-27144.

Hu, Shimin.,Zeng, Jiajie.,Zhu, Xiangyu.,Guo, Jingjing.,Chen, Shuming.,...&Tang, Ben Zhong.(2019).Universal Bipolar Host Materials for Blue, Green, and Red Phosphorescent OLEDs with Excellent Efficiencies and Small-Efficiency Roll-Off.ACS Applied Materials & Interfaces,11(30),27134-27144.

Hu, Shimin,et al."Universal Bipolar Host Materials for Blue, Green, and Red Phosphorescent OLEDs with Excellent Efficiencies and Small-Efficiency Roll-Off".ACS Applied Materials & Interfaces 11.30(2019):27134-27144.